After the extraction of the bite of cotton to stop bleeding generally need to be removed, otherwise dry socket and other conditions may occur, and because of the root canal treatment and the former stuffed for anti-inflammatory and pain relief of cotton, the need to let the doctor change or treatment of the tooth at the time of follow-up. 1. After the extraction of teeth may bleed, you can generally bite the cotton to pressurize the cotton to reduce the amount of bleeding, and thus achieve the purpose of alleviating the bleeding generally in 30 ~ 40 minutes after the bleeding stops you can take out the cotton ball, if the cotton ball is not taken out, the long term stagnation in the mouth within the mouth, it is easy to lead to plaque, and even dry socket and other situations. 2. If the cotton ball is not taken out after tooth extraction, go to the hospital as soon as possible to consult the doctor and let him take it out according to the situation. 3. In case of root canal treatment or pulpitis before tooth extraction, the cotton filled in the cavity is dipped in anti-inflammatory and nerve-killing medication, which kills the nerve and disinfects and prevents the entry of foreign objects. In this case, you should not remove it by yourself, and you need to go to the doctor for a follow-up appointment within the time specified by the doctor, so that the doctor can refill the filling or perform an extraction and root canal treatment. You will need to consult with your doctor about your options.